熔模铸造工艺中采用sf6和3m novec 612作为保护气体,研究了az91E镁合金的结晶金属反应

M. Dyčka, M. Juliš, L. Klakurková, L. Dyčková, P. Gejdoš
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引用次数: 0

摘要

本文研究了陶瓷壳与镁合金AZ91E之间的模具金属反应强度。研究了SF6(六氟化硫)和3M NOVEC 612两种可能用于熔体保护的保护气体。采用扫描电子显微镜(SEM)和x射线能谱仪(EDS)对镁合金与陶瓷壳界面上的模-金属反应产物进行了分析。观察到AZ91E对陶瓷壳的渗透,模-金属反应产物层厚度为0 ~ 80 μm。铸件外表面的金属反应强度远高于内表面。较厚的细锆石颗粒层作为第一层陶瓷壳层似乎将模具金属反应强度降低到最低。当使用SF6时,观察到AZ91E对陶瓷壳的渗透,腐蚀层由富al相组成,氧含量较高。使用3M NOVEC 612作为保护气体,在陶瓷壳和镁合金之间形成了连续的MgO层,该层的厚度可达60 μm,具体厚度取决于陶瓷壳的成分。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
mold metal reactions of magnesium alloy az91E using sf6 and 3m novec 612 as protective gasses in investment casting technology
In this article, the intensity of mold metal reactions between ceramic shell and magnesium alloy AZ91E is studied. The two possible protective gasses used for melt protection are studied SF6 (sulphur hexafluoride) and 3M NOVEC 612. The scanning electron microscopy (SEM) with X-ray spectroscopy (EDS) were used for the analyses of the mold-metal reaction products on the interface between the magnesium alloy and the ceramic shell. Penetration of AZ91E into the ceramic shell was observed, thickness of mold-metal reaction products layer ranged from 0 μm to 80 μm. The intensity of mold metal reaction is much higher on the outer surface than on the inner surface of the casting. The thicker layer of the fine zircon particles as the first layer of ceramic shell seems to lower the mold metal reactions intensity to minimum. While using SF6, the penetration of AZ91E into ceramic shell was observed, the corroded layer consists of Al-enriched phase with higher content of oxygen. The use of 3M NOVEC 612 as the protective gas led to formation of continuous MgO layer between the ceramic shell and the magnesium alloy, thickness of this layer was up to 60 μm depending on the ceramic shell composition in the close surrounding area.
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